Gas. For hydrogen to become a liquid, you need to cool it down to 20.28 K, which is -252.87 degrees Celcius, or -434.45 degrees Fahrenheit if that is more your style. 6 people found this useful.
Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  voice, sound, vocalize, vocalise(verb) utter with vibrating vocal chords. 2  vocalize, vocalise(verb) sing (each note a scale or in a melody) with the same vowel. 3  vocalize, vocalise, vowelize, vowelise(verb) pronounce as a vowel.
5. vociferous, outspoken. 1  of, pertaining to, or uttered with the voice:the vocal mechanism; vocal criticism. 2  Music and Dancerendered by or intended for singing:vocal music. 3  having a voice:A dog is a vocal, but not a verbal, being. 4  giving forth sound with or as with a voice.